Hydrofast C100 Chilled RO Water Purifier

A grey countertop RO purifier with cooling built in. It keeps 1.3 litres at room temperature and 0.5 litres chilled, and one button switches between 10 °C cold water and ambient.

~~$399~~

5%$379

Price with code · Geekbuying · as of 2026-10-09

Code 26BTS01 · 6% off

max $20 · orders over $50 · until 2026-10-31

Copy code & shop Geekbuying

~~$399~~5%$379Copy code & shop Geekbuying

1Cold at 10 °C or room temperature

Hold the cold button for five seconds to start cooling, and it pours water at 10 °C (50 °F). A blue light means cold and white means ambient.

2Six stages and 24-hour UV

PP, coconut carbon, RO, post carbon and mineral stages share one cartridge, backed by UV sterilisation that runs around the clock. TDS drops by up to 95%.

3A 4-litre side tank at 3:1

Pour tap water into the side tank—no plumbing—and it runs at a 3:1 pure-to-drain ratio. It has 100/250/450/600 ml presets, live TDS and a filter-life display.

Key specs

Filtration: PP + CTO + RO + PCF + MIN + UV
Water tank: Raw 4 L · ambient 1.3 L · cold 0.5 L
Cold water: 10 °C
Power input: 110–130 V · 100 W
Weight: 5.9 kg
Ships from: US warehouse

Good pick if

You’re on 110 V mains and want cold filtered water
You want to avoid installing a plumbed purifier

Think twice if

You only have 220–240 V mains

FAQ

Is there a promo code?

Yes. Enter 26BTS01 at Geekbuying checkout when buying the Hydrofast C100 Chilled RO Water Purifier for 6% off. Conditions: max $20 · orders over $50 · until 2026-10-31.

Which voltage does it need?

It takes 110–130 V, so it’s meant for 110 V regions like the US and won’t run on 220 V mains without a transformer. It ships from the US warehouse.

How is it different from the B100?

The C100 adds cooling, with a separate 0.5-litre cold chamber serving water at 10 °C. The filtration, 4-litre raw tank and 3:1 ratio are the same.